before you get into DISCOUNTS, you must understand that there is absolutely no rhyme or reason for the determination of LISTING PRICES:
Some SELLERS will put a high Listing Price on their home, believing that people will make an offer, and they can always come down. In truth, people will bypass the home and look for something reasonable. And 6 months later, they will start to lower the price, chase the curve, and wonder why no one calls; the people now believe that something is wrong with the property.
Some Sellers will put a LOW price on it, hoping to attract multiple offers. (The correct strategy.)